Post a screenshot of one your "pages" that you think looks bad. Maybe there are some simple improvements you can make.
Explain what the page is trying to accomplish. Design is one part of functionality. If we don't know what function it serves, then no one can say whether the design fits the function.
Good design can't be summarized as tips on a website. For the same kinds of reasons that good programming can't be summarized as tips on a website.